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*To*: tesla-at-pupman-dot-com*Subject*: Re: Variable Capacitance and Inductance*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sat, 25 May 2002 09:45:21 -0600*Resent-Date*: Sat, 25 May 2002 09:46:11 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <dRznjD.A.cw.BH778-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com> Ed: you are correct the gradient dose not change physical capacitance dimensions, but we measure the effect of capacitance with the static charge on the plates of a capacitor and the change of charge and frequency of a circuit which is altered by surounding forces of charge. That is why an oscilator circuit is placed inside a shield can to minimize these effects. As long as we measure capacitance by its effect we will see changes in measured results even tho the dimensions havent changed. Robert H > From: "Tesla list" <tesla-at-pupman-dot-com> > Date: Fri, 24 May 2002 19:16:46 -0600 > To: tesla-at-pupman-dot-com > Subject: Re: Variable Capacitance and Inductance > Resent-From: tesla-at-pupman-dot-com > Resent-Date: Fri, 24 May 2002 19:27:13 -0600 > > Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" > <evp-at-pacbell-dot-net> > > Tesla list wrote: >> >> Original poster: "rheidlebaugh by way of Terry Fritz > <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com> >> >> Jim: I believe if you measure the electrostatic gradient of the earth you >> will be quite impressed how large the charge change with elevation is. The >> change is large enough to measure changes in cm of height from the earth >> surface. It has been used to control wing level on drone aircraft. >> Robert H > > The electric field gradient does indeed vary with altitude, but that's > due to geometric effects and has nothing to do with capacitance. The > use of field measurements for attitude control was first done by RC > model enthusiasts, more than 20 years ago, and does indeed give a useful > degree of level sensing. > > Ed > > >

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